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5.1 Medium

CVE-2026-34757 LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network…

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

Affected products and versions

Product Affected versions Fixed in
libpng 1.0 1.0.9 → < 1.6.57 1.6.57

References

Timeline

  1. Published
  2. Last modified

Other CVEs of libpng

The 13 CVEs of libpng →
CVE-2026-40930 LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files 5.4 Medium CVE-2026-33636 LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network… 7.6 High CVE-2026-33416 LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network… 7.5 High CVE-2026-3713 A flaw has been found in pnggroup libpng up to 1.6.55 4.8 Medium
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